Speed-adjusting means for rotary hydraulic devices.



H. D. WILLIAMS & R. JANNBY.

SPEED ADJUSTING MEANS FOR ROTARY HYDRAULIC nnvwss.

. APPLICATION FILED JUNE 3, 1911. 1,062,07 1

6 SHEETS-SHEET 1.

Patented May 20, 1913.

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SPEED ADJUSTING MEANS FOR ROTARY HYDRAULIG DEVICES.

- APPLIGATION FILED JUNE 3, 1911.

- 1,062,071. Patented May 20, 1913.

6 SHEETS-SHEET 3.

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H. D. WILLIAMS & R. JANNEY.

SPEED ADJUSTING MEANS FOR ROTARY HYDRAULIG DEVICES.

APPLICATION FILED JUNE 8, 1911.

1,062,071. Patented May 20, 1913.

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mmas'sss: wry/Mrs g7 4 l/l/PVE) i. W/lL/AM-s 8/ 00 4/0 4141mm H. D.WILLIAMS & R. JANNEY. SHED ADJUSTING MEANS FOR ROTARY HYDRAULIC DEVICES.

APPLICATION FILED JUNE 3, 1911.

6 SHEETS-SHEET 6.

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HARVEY D. WILLIAMS AND BEYNOLD JANNEY, OF NEW YORK, N. Y., ASSIGNORS -TOWATERBURY TOOL'COMPANY, OF WATERBUR Y, CONNECTICUT, A CORPORATION OFCONNECTICUT.

BPEED-AIIJUSTING MEANS FOR ROTARY HYDRAULIC DEVICES.

Specification of Letters Patent. Application filed June 3, 1911. SerialNo. 631,092.

Patented May 20, 1913.

To all whom it may concern:

Be it known that we, HARvEr D. W' L- LIAMS and REYNOLD JANNEY, bot-hcitizens of the United States, and residents of the borough ofManhattan, city, county, and State of New York, have invented certainnew and useful Improvements in Speed-- Adjusting Means for RotaryHydraulic .Devices, of which thefollowing is a specifica tion.

Our present invention is designed foruse particularly in connectionwithrotary pumps of variable discharge such as described as one of themembers of a variable speed gear in Letters Patent No. 925,148

. granted to one of us (Harvey D. Williams) on June 15,1909. In thispatented device, the discharge of the pump can be varied by adjustingthe inclination of a rotary tilting box or race which according to theangle it forms with a plane perpendicular to the shaft, ives a longer orshorter stroke to the box, making this operation pump pistons. The chiefobject of our present invention is to assist the manual operation ofadjusting or inclining the tilting uicker an easier. Another object ofour lnventionis to lock the tilting box in wliateverposition it happensto be when the manual effort for tilting ceases. Both of these objectswe atr tain by utilizing, in they manner set forth hereinafter, certainchanges which occur during the operation of the apparatus,' as regardsthe position of the center ofpressure on the tilting box and the partssharing its adjustment.

\Vhde we have'shown and described but one specific example of ourinvention, we desire it to be well understood that the novelarrangements and combinations set forth in the appended claims may becarried out and applied in many other ways, and that we therefore do notrestrict ourselves to the particular construction illustrated.

Reference is to be had to the accompanying drawings inwhich- Figure 1 1salongltudinal vertical section of a pump''embodying our present.invention; Fig. 2 is a partial horizontal section, taken on line,'2.- 2of Fig. 1; Fig. 3 is a horizontal section, upon a larger scale than igxgrand taken .o 3:5 o

Fig. 4; Fig. 4 is a vertical section on line .4--4 of Fig. 3; Figs.'5and 6 are details of the adjusting piston, Fig. 5 being a cross sectionon line 5-5 of Fig. 6. Figs. 7 and 8 are vertical cross sections, on theplane indlcated by the line 77 of Fig. 1, showing the cylinder barrel ofthe pump in two dif- I ferent positions, and Figs. 9 to 13 arediagrammatic views of the ports in the stationary valve plate and theports of the cylinder barrel, Fig. 13 being a partial view only.

In its general features, the pump represented in the accompanyingdrawings corresponds to the one forming part ofthe variable speed gearshown in the aforesaid Letters Patent No. 925,148, and a briefdescription of these general features will therefore sufiice. Thestandard 20 which carries the bearing 21 'for the drive shaft 22, isconnected rigidly or made integral with the closed casing or shell 23(provided with cooling ribs 24 to dissipate heat) connected with thestationary valve plate 25 on the standard 26. The valve plate 25 has twosegmental ports 27 and 28 one of which acts as a suction port and theother asa delivery port, these ports being connected with correspondingpipes or conduits 29 and 30 respectively. The inner surface of the valveplate 25 is engaged by a rotary barrel 31 made with longltudinalcylinders 32 rovid ed at the ends adjacent to the valve p ate, withcontracted ports 33 e. ports smaller than the cylinder bore) arranged toregister with the valve plate ports 27 and 28. Prefkeys 40 fitted intolongitudinal .keyways v41 loo of the barrel 31. The'keys are beveledto-v ward both ends so thatthe barrel may rock slightly to bring itscontact'face into er-R feet e gageme t with the errespe .i g

face of the valve plate 25. The shaft 37 is journaled in the valve plate25. In the cylinders 32 are adapted to reciprocate the pistons 43pivotally connected by rods 44 with a socket ring 45 provided with arace 42 running upon bearing balls 46 which engage a race 47 andare heldproperly spaced by a cage 48. Trunnions 49 located centrally in theplane of the socket ring 45, connect this ring with an intermediate ringor sleeve 50 pivotally connected with the shaft 22 by means of a pin 51located in the same plane with the trunnions 49, but at a right angle tothe axis of said trunnions. At 52 we have indicated a reservoir fromwhich the pump may be filled at the beginning of the operation. andwhich also serves as an expan sion chamber for the oil as it becomesheated during the operation. A vent 52 places this chamber incommunication with the surrounding air. At the bottom of the casing 23We provide a drain plug 53. The race 47 forms part of or is rigidlysecured to the tilting box 54 which is normally stationary but may beadjusted to different inclinations, being fulcrumed on the casing 23 bymeans of trunnions 55 which are in line with the point where the axis ofthe pin 51 intersects the axis of the shaft 22.

The tilting box 54 has two forks 56 extending from it in planesperpendicular to its axis of oscillation or adjustment formed by thetrunnions 55. The opposing members of each fork constitute slideways onwhich,

blocks 57 (Fig. 3) may move in and out relatively to the forks. Theblocks 57 have round holes through which extend trunnions 58 projectedfrom a long piston 59. Each of these trunnions 58 also extends throughopenings in blocks or slides 60 guided to movevertically in suitableways 61 of the casing 23. This construction supports the long piston atits central portion and keeps it from being bent. This central portiontal shaft 67 journaled in the casing 23 and projecting therefrom so thatit may be turned by means of a suitable crank or handle (not shown)applied to the free end of the shaft. The upper and lower portions 68 ofthe piston 59 are tubular and are provided near the central portion withports leading to channels 69 which communicate 66 with the interior ofthe casing 23 which, as

has a hole 62 into which is fitted a stud 63,

will be understood, is filled with oil. Adjacent to said ports are seatsfor valves 70 opening outwardly and pressed toward their seats by lightsprings 71 whose outer ends bear against apertured holders or spiders 72fitted within the bore of the piston and carried by the inner ends ofpins or stems 73.

The outer ends of these stems are enlarged and screw-threaded as at 74to fit into the outer ends of the tubular piston portions 68. The stud63 has a flattened end portion, and on eachside a pin member or valvelifter 75 is interposed between the flat face of the stud 63 and thecorresponding ball valve 70. The lifter may engage the valvepermanently, or a slight play may be allowed. Each tubular pistonportion 68 is fitted to slide up or down in a stationary cylinder 76 andheld by means of three set screws 77 carried by a sleeve 78. Only one ofthese set screws appears in Fig. 4. These sleeves screw into suitablesockets 79 of the casing 23, and the outer ends of the cylinders areengaged by screw plugs 80 closing the outer ends of the sleeves 78. Thisconstruction allows the parts to be assembled and dismembered readily.The screws 77 hold each cylinder 76 against the corresponding plug 80,but they allow the other end of the cylinder, and in fact the whole ofthe cylinder, some latitude of movement, since there is a clearancebetween the bottom (or top) of the annular groove and the ends of thescrews which project into said groove, and also a clearance between thecylinder and the inner wall of the sleeve 78. The purpose of this playis to insure freedom for the up and down movement of the piston 59, 68in the cylinders 76 Without binding, while the sections 68 are closelyfitted to these cylinders, no great nicety of alinement of thepartsbeing required. The space within each cylinder 76 communicates withthe space within the corresponding tubular piston portion 68 by means ofa duct 81 extending through the stem 73 and its enlarged end 74.

In order that the operation of the improved adjusting and locking devicemay be fully understood, we will first explain with particular referenceto Figs. 7 to 12, how variations arise in the position of the center ofpressure on the tilting box 54 and on the socket ring 45. Let us supposethat the port 28 shown in these views at the right hand, is the highpressure or delivery port. In the positions or phases illustrated byFigs. 7 and 8 (and also 9 and 12) four of the nine cylinders 32 of therotary barrel 31 have their ports 33 in communication with the saiddelivery or high-pressure port 28 of the stationary valve plate 25. Theother five cylinders are either in communication with the suction orlow-pressure port 27 on the other side ofthe valve plate, or else cutring 45, andthe ball t rust bearing 46,47,"

off on the solid top and at the ottom of the valve plate. Of course, theoil being driven out of the said four cylinders exerts a back ressureagainst the respective pistons 43, and thence through the connectin rods44, thesocket against thetilting box 54. This pressure would have notendency to tilt the tilting box 54 on its trunnions if the center ofpressure of the fourcylinders I, II, III

and IV was in the horizontal plane passing through the axes of the twotrunnions. 55 on which the tilting box 54 is mounted. But

as matter of fact, the center of pressure of these cylinders when in thephase shown in Fig. 7 is at the point G, which is below this horizontalplane. In Fi'. 1 this center of pressure may be indicate by the arrowG.It will be seen that at this instantthe tendency is to tilt the tiltingbox from the position shown toward the position in which the plane ofthe ball thrust hearing would be at ri ht angles to the axis of theshaft 22. It may e added that the location .of the center of pressure ofcylinders I, II, III and IV can be determined" bydrawing a line from thecenter of cylinder I to the center of cylinder II, and another line fromthe center of cylinder III to the center of cylinder IV and thenconnecting the central points of these two lines. The central point ofthis last connecting line is the true location of the point G, thecenter of pressure of these four cylinders.

In Fig.8 the cylinders are shown in a different phase of the rotation-asrelated to the valve plate port 28. Adopting the same method of locatingthe center of pressure, we now find that it is at H, which is above thehorizontal plane passing through the axes of the tilting box trunnions-(see also arrow H in Fig. 1). At this instant, and in fact whenever thecenter of pressure is above the horizontal plane, the tendency is totilt the tilting box away from its present position and make it occupy aposition still farther removed from. that in which the ball 1 thrusthearing would be in a plane at right angles to the shaft 22. While thecylinder barrel 31 is rotating the location of the center of pressure isconstantly changing. It-

will move from one side of the horizontal plane to the other accordingto the phase of the cylinder ports 33 in relation to the high pressurevalve plate port 28. The cycle of the changes of position of the centerof pres sure is made as many times per revolution of the shaft as thereare cylinders 32 in the cylinder barrel '31. Thus it will be seen thatif, for example, there are nine cylinders in the cylinder barrel thereare in each revolution nine periods during which-the tendency is to.tilt the tiltin box toward the right angle positinn, an nine periodsdurlng imam ortions or lands at theward, an thus throu -h medium 0 isnot immediately effective, the stud 63 by bearin against the u per wallof the hole 62in t e iston 59 wi move the pisiton upt e trunnions 58 andthe bloc s 57' will tilt the tilting .box. The tendency of thetiltingbox to oscillate will assist the stud to move the piston upwardby the method now to bepomted,o11t.or the tendency to oscillationof thetilting box may alone cause the piston to move upward .before theystud-63 actually touches the upper side ofxthe holein the pistori .59.When stud .63' is 'at its neutral position, bothballs are seated, andthe piston sections 68-cannot move 11 ordown 1n the cylinders 76 becausethe cy inders are full of oil. Therefore the fork 56 of the tilting box54, the position of ivhich is determined by the position of thepiston,-does not allow the tilting box to tilt on its trunnions,'butlocks it rigidly in its position, whatever that posi-' tion may be. Butwhen the control shaft 67 and. the pinion 66 are turned left hand, ac-

cording .to the above suppositiomso that the rack 64 with its stud 63moves upward and .tliepin raises its ball ,70'from its seat,

then the .oil in the uppercylinder7 6 is free to flow past the ballvalve-70, thus allowing the piston to move upward. This the piston has atendency to do at the instant when the fork 56 of the tilting box 54tends, on account of the location of the center ofpressure forthatmoment below-the horizontal plane passing through the trunnions 55,to move upward. The upward movement of the piston causing a sli htvacuum in the lower cylinder 76 the o' ofthe pump case under atmosphericpressure depresses the s ring '1: 1 supporting the lower ball 70 andalows oil from the case '23 'to fiow into -the lower cylinder 76. At thenextinstant the center of pressure bein above the saidhorizontal plane,the for 56 .tendsf to move downward, but it cannot move the piston 59,

68. downward for the lower' iva'ive ball 70 now being seated preventsthis. ;-The operator is still turning-the pinion'66 the left handdirection and thestud 63 is moving upward in the hole 62 in the piston59 while the iston itself is bein c'ausedto 0 upwar by t-hetendency othe'tilting x 54 to oscillate, as just described. Thus the operatorbrings about a follow-up movement, keeping the upper ball 7 0 off-itsseat so that the pressures in themaehinecan-cause the piston 59, 68 togo upward. A s just explained, they cannot cause it to go down ward.Thus the operator is able by very slight effort to utilize the forces inthe machine to do his work. This work is done more quickly than he coulddo it himself by manual effort. and when the slight effort which heexerts ceases, the position of the tilting box 54 becomes fixed, asalready shown, so that he does not have to exert any effort in keepingthe tilting box where it is.

If the operator should turn the control shaft 67 and pinion 66 in theright hand direction,

from the high pressure side (say, on the right). These figures'alsodiffer from Figs. 7 and 8 by showing only the cylinder ports and not thecylinders themselves. Fig. 9 corresponds to Fig. 7, and illustrates adifferent method for locating the center of pressure for the fourcylinders whose ports I, II, III, IV are (at this stage) incommunication with the delivery or high-pressure port 28. A line isdrawn connecting the centers of the ports I and IV, another lineconnects the centers of the ports II and III, the central points ofthese two lines are connected, and the central point A of thistransverse line is the resultant center of pressure, corresponding tothe point G of Figs. 1 and 7. If we suppose-the cylinder barrel to berotating clockwise as indicated by the arrows, the cylinder orts willsoon reach the position shown in ig. 10, where the port IX communicateswith the valve plate port 28 while the latter is still in communicationwith the cylinder ports I, II, III and IV. There will then be fivecylinders under pressure and the resultant center of pressure will beshifted instantly from the point A inward along the, line connecting -Awith the center of port IX, to the point B. As long as these same fiveports remain in communication with the high pressure port 28 (say up toand including the position Fig. 11) the center of pressure remains atthesame point of the rotating barrel and therefore moves in the arc of acircle, as indicated at BC. A still further rotation of the barrel 31will bring the port IV over the land (at the bottom of Fig. 12) betweenthe high pressure port 28 and the low ressure port 27, so that now onlythe cylinder ports IX, I, II and III communicate with the high pressureport 28. The instant only four cylinder ports, are in communication 7with the port 28, the resultant center of pressure is shifted diagonallyoutward to a point D which is at the same distance from the axis orcenter 0 as the point A, but above the horizontal line indicating thehorizontal plane passing through the trunnions 55. This is the positionshown in Fig. 12 (which corresponds to Fig. 8). By a. further rotationthe barrel 31 passes from the position shown in Fig. 12 to one similarto that shown in Fig. 9, and during this stage the center of pressuremoves along the are D, A. The operation is then repeated. Thus at eachrevolution of the barrel 31, the resultant center of pressure will moveor shift nine times in the following path: from the point A (Fig. 9)diagonally inward and upward to the point B, then downward along the arcBC then diagonally outward and upward to the point D and finallydownward along the arc D-A.

From the above it will be evident that the tilting box 54 or any otherstructure containing the nine. connecting rod sockets, will have atendency to oscillate if the tilting box is supported on an axisparallel with the horizontal line shown in Figs. 9 to 12, for the reasonthat a part of the time the resultant center of pressure is above theline and a part of the time below. In actual practice, however, timebecomes a very important element. For example, when port IX enterscommunication with the high pressure port 28, the liquid cannot passthrough the restricted opening 34 forming the beginning of acommunication (Fig. 10) before the cylinder barrel has rotated aperceptible distance. For example, should this be rotating at the rateof 500 revolutions per minute, the port IX may be carried a distance of3 or 4.-, or possibly more, before the full pressure can be brought tobear on the piston corresponding to port IX. The result will be that thecenter of pressure will not be shifted instantly from A to B, but willbe carried downward farther than A, while at the same time it is beingshifted toward IX as rapidly as IX can be brought under high pressure.The result will be as indicated in Fig. 13 wherein the pressure isindicated as shifted from A to B, all being below thev horizontal line.Furthermore when port IV passes from the pressure and is on the blankspace at the bottom, it carries with it the same pressure which it hadreceived from the high pressure port 28 and is only relieved gradually.This will cause the resultant pressure to be carried down below C, asindicated in Fig. 13 to a point C, gradually being shifted diagonallyacross to D, but'not reaching D until the cylinder barrel has rotated aperceptible distance.

The result of this time element may be such as to keep the pressureentirely below the central horizontal line, or at least the greater partof the pressure movement will bebelow this line. This would cause theoscillating tilting box to have a tendency to move in one directiononly, but with varying pres: sure. There is, however,'another element inthe practical operation of the mechanism which may have a very decidedeffect, and

a it may be so controlled as to notonly modify the movement of thecenter of pressure as indicated above, but may even predominate overthese movements. We refer to the effect produced by widening the blankspaces or lands between the ports 27 and 28 (in the manner set forth inReynold J anneys Patent No.'951,27 8 of March 8, 1910) or by restrictedextensions 34 of these ports into these blank spaces as indicated by thedotted lines in Figs. 9 to 12. For example, when port IX is over theland at the top (Fig. 10) the piston corresponding to this port may beof it after. port IX passes the center of the land, moving to the right.This will cause the pressure in the cylinder in front of the piston toreach an amount desired before the port IX enters mto communication withthe high pressure port 28 of the valve plate. This may cause theresultant pressure to be shifted from A to B independently of the highpressure port- 28 of the valve plate. Moreover port IV as it passes fromthe land at the bottom (Figs. 11 and 12) may enter communication withthe low pressure port 27 so late that the piston corresponding to portIV has a perceptible distance to recede before the cylinder port IVenters communication with the low pressure port 27. This recession ofthe piston will cause an immediate reduction of the pressure on it andso may afiect the shift of the center of pressure from C to D.

By combining the two effects or factors described above it is possibleto cause the resultant center of pressure to shift across the horizontalcenter line in such manner as to bring about any desired oscillatingeifect in the tilting box that is subjected to the piston pressures.

The tilting of the tilting box 54 is affected not only by the shiftingof the center of pressure as described above, but by other causes,particularly the elasticity of the parts and the inertia of the oil.

effect or assist the adjustment of said part,

and also to lock: or hold it after adjustment. In its broader aspects,our invention is set it forth and claimed in our divisionalapplicamoving so as to compress any fluid in front While described as apump, the device spa tion, Serial Number 706,612, filed June 29,

'. Various modifications may be made with out. departing from the natureof our invention as set forth in the appended claims.

We claim: 1. The combination of a ported valve plate, 'a rotary barrelhaving cylinders arranged to communicate with the ports of the saidplate, pistons n said cylinders, a ro- 5 tary ring and means connect-mg1t with the pistons in such a manner that rotation of 'saidpiston havingtwo passages leading from the respective stationary cylinders, checkvalves controlling said passages, an

operating member having a limited movement lengthwise of the piston tofirst unseat one of the check valves and then engage the piston, andmeans for actuating said member.-

2. The. combination of a ported valve plate, a rotary barrel havingcylinders arranged to communicate with the ports of the said plate,pistons in said cylinders, a rotary ring and means connecting it withthe pistons in such a manner that rotation of the barrel and ring willbe simultaneous with reciprocation of the'pistons, a tiltin box providedwith a race on which said ring is mounted to turn, a piston operativelyconnected with said box to vary its inclination, stationary spacedcylinders in which the respective ends. of said piston are movable, saidpiston having two passages leading from the respective stationarycylinders,

check valves controlling said passages, an

operating member movable relatively to the piston and adapted to unseatone or the other of said check valves,and means for actuating saidmember.

3. The combination of a ported valveplate, a rotary barrel havingcylinders arranged to communicate with the ports of the said plate,pistons in said cylinders, a rotary ring and'means connecting it withthe pistons in such a manner that rotation of the barrel and ring willbe simultaneous with reciprocation of the pistons, a tilting boxprovided with a race on which said ring is mounted to turn, a pistonoperatively connected with said box to vary its inclination, and havinga transverse aperture or socket in its central portion, stationarycylinders in which the respective ends of said piston are movable, anoperating member havin a portion or lug projecting into said soc et andcapable of an independent movement therein, and means, controlled bysuch independent movement, for 0 ening fan outlet 7 plate, a rotarybarrel having cylinders arranged to communicate with the ports of thesaid plate, pistons in said cylinders, a rotary ring and meansconnecting it with the pistons in such a manner that rotation of thebarrel and ring will be simultaneous with reciprocation of the pistons,a tilting box provided with a race on which said ring is mounted toturn,- a piston operatively connected with said box to vary itsinclination and provided at its central portion with a transverseaperture or socket, and with communicating ports and also provided withpassages leading from the piston ends to said p'orts, stationarycylinders in which the respective piston ends are movable and with whichsaid passages communicate, check valves located in said passages andopening toward the cylinders and an operating mem- I ber having aportion projecting into said socketand capable of an independentmovement therein to unseat one or the other of said check valves. 1 r

5. The combination of a ported valve plate, a rotary barrel havingcylinders arranged to communicate with the ports of the said plate,pistons in-said cylinders, a rotary ring and means connecting it withthe pistons in such a manner that rotation of the.

barrel and ring willbe simultaneous with reciprocation of the pistons, atilting box. provided with a race on which said ring 1s mounted to turn,a piston operatively connected with said box to vary its inclination,stationary cylinders in which the respective ends of the said piston aremovable, sleeves into which said cylinders are fitted loosely, means forsecuring the outer portions of the cylinders to the sleeves in such amanner as to allow some relative play, an operating member movablerelatively to the piston, and means, controlled by such movementof theoperating member, for opening an outlet from one stationary cylinder orthe other.

6. The combination of a ported valve plate, a rotary barrel havingcylinders arranged to communicate with the ports of the said plate,pistons in said cylinders, a rotary ring and means connecting it withthe pistons in such a manner that rotation of the barrel and ring willbe simultaneous with reciprocation of the pistons, a tilting boxprovided with a race-on which said ring is mounted to turn, a pistonoperatively connected with said box to vary its inclination,

stationary cylinders in which the respective ends of the said piston aremovable, sl eves into which the said cylinders are tted loosely, meansfor securing, the outer portions of the cylinders to the sleeves in sucha manner as to allow some relative play, means for closing the outerends of the reason sleeves, an operating member movable relatively tothe piston, andmeans, controlled by such movement of the operatingmember, for opening an outlet from one stationary cylinder or ,theother.

7. The combination of a ported valve plate, a rotary barrel havin clinders arranged to communicate with t e ports of said plate, pistons insaid cylinders, a rotary ring and means connecting it with thepistons'in such amanner that rotation of the barrel and ring will besimultaneous with reciprocation of the pistons, a tiltin boxprovidedwith a race on which said mug is mounted to turn and with afork, a block slidable on said fork toward and from the fulcrum of thetilting 'box, an operating member havin a pivotal connection with saidblock, an a slide likewise having a pivotal connection with theoperating member and guided upon a stationary part of the structure.

' 8.- The combination of a ported valve plate, a rotary barrel havingcylinders arranged to communicate with the ports of said plate, pistonsin said cylinders, a rotary ring and means connecting it with thepistons insuch a manner that rotation of the barrel and ring will besimultaneous with reciprocation of the pistons, a tilting box providedwith a race on which said ring is mounted to turn and with two spacedforks, a block slidable on each fork toward and from the fulcrum of thetilting box, an operating member extending between said 100 forks andhaving a pivotal connection with each of said blocks, and two slideslikewise pivotally connected with the operating member and each guidedupon some stationary part of the structure.

9. The combination of a ported valve plate, a rotary barrel havingcylinders arranged to communicate with the ports of said plate, pistonsin said cylinders, a rotary ring and means connecting it with the'pis- 10 tons, in such a manner that rotation of the barrel and ring will besimultaneous with reciprocation of the pistons, a tilting box providedwith a race on which said ring is mounted to turn, a piston whosecentral 1 5 portion .is operatively connected with the tilting box tovary'its inclination, stationary cylinders in which the respective endsof the piston are movable, means for bracing and guiding the centralportion of theme piston, and mechanism for. controlling the movement ofthe piston. I

10. The combination of a ported valve plate, a rotary barrel havingcylinders arran ed to communicate with the ports of 125 sai plate,pistons in said cylinders a rotary ring and means connecting it with thepistons in such a manner thatrotation of the barrel and ring will besimultaneous with reciprocation of the pistons, a tilting box 139provided with a. race on which said ring is mounted to turn, a membermovable transversely to the axis of the tilting box and operativelyconnected with said box to vary its inclination, spaced guidin meansengaging the ends of said mem 'er, separate means for guiding andbracing the central portion of said member, and mechanism forcontrolling the movement of said member.

11. The combination of a ported valve plate, a rotary barrel havingcylinders arranged to communicate with the ports of said plate, pistonsin said cylinders, a rotary ring and means connecting it with thepistons in such a manner that rotation of the barrel and ring will besimultaneous with reciprocation of the pistons, a tilting box providedwith a race on which said ring is mounted to turn, a member movabletransversely of the axis of the tilting box and operatively connectedwith said box to vary its inclination, means for normally locking saidmember, and an operating member movable in the same direction as thefirstnamed member and having a limited movement relatively thereto tofirst unlock said member before enga 'ng it, said operating member beingprovi ed with a rack, and a pinion, in mesh with said rack, and mountedto turn about an axis parallel to that of the tilting box.

' 12. The combination of a ported valve I plate, a shaft journaledtherein, a rotary barrel surrounding the shaft and provided withcylinders arranged to communicate with the ports of said plate, saidbarrel havand means connecting said ring with the pistons in such amanner that rotation of the barrel and rings will be simultaneous withreciprocation of the istons.

In witness whereo we have hereunto set our hands in the presence ofsubscribing witnesses.

HARVEY D. WILLIAMS. REYNOLD JANNEY.

Witnesses as to Harvey D. Williams: THoMAs L. VAN NQRDEN, HY C.HAMILTON. Witnesses as to Reynold J anney: THOMAS L. VAN NORDEN,

BEATRICE LANos'rRo'rH.

